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  <title>OpenSLP Programmers Guide - SLPFindSrvTypes()</title>
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<h2>SLPFindSrvTypes<br />
<span id="breadcrumbs"><a href="index.html">OpenSLP Programmer's Guide</a> &raquo; Service Location Functions &raquo; <a href="SLPFindSrvTypes.html">SLPFindSrvTypes</a></span></h2>

<h3>Declaration</h3>

<pre>#include &lt;slp.h&gt;

<a href="SLPTypes.html#SLPEXP">SLPEXP</a> <a href="SLPError.html">SLPError</a> <a href="SLPTypes.html#SLPAPI">SLPAPI</a> SLPFindSrvTypes(
    <a href="SLPTypes.html#SLPHandle">SLPHandle</a>          <a href="#hslp">hslp</a>,
    const char *       <a href="#namingauthority">namingauthority</a>,
    const char *       <a href="#scopelist">scopelist</a>,
    <a href="SLPSrvTypeCallback.html">SLPSrvTypeCallback</a> <a href="#callback">callback</a>,
    void *             <a href="#cookie">cookie</a>);
</pre>

<h3>Description</h3>

<p>The <tt>SLPFindSrvType()</tt> function issues an SLP service 
type request for service types in the scopes indicated by 
the <tt>scopelist</tt>. The results are returned through the <tt>
callback</tt> parameter. The service types are independent 
of language locale, but only for services registered in one 
of scopes and for the indicated naming authority.</p>

<p>If the <tt>namingauthority</tt> is &quot;*&quot;, then results are returned for all 
naming authorities. If the naming authority is the empty string, i.e. &quot;&quot;, then 
the default naming authority, &quot;IANA&quot;, is used. &quot;IANA&quot; is not a valid naming 
authority name, and it is a <tt><a href="SLPError.html#SLP_PARAMETER_BAD">SLP_PARAMETER_BAD</a></tt>
error to include it explicitly.</p>

<p>The service type names are returned with the naming authority intact. If the 
naming authority is the default (i.e. empty string) then it is omitted, as is 
the separating &quot;.&quot;. Service type names from URLs of the service: scheme are 
returned with the &quot;service:&quot; prefix intact.</p>

<h3>Parameters</h3>

<table nosave="" border="1" cellpadding="5">
  <tbody>
    <tr nosave="" valign="top">
      <td nosave=""><a name="hslp"></a><tt>hslp</tt></td>
      <td nosave="">The language specific <tt>SLPHandle</tt> on which to 
	  register the service.</td>
    </tr>
    <tr nosave="" valign="top">
      <td nosave=""><a name="namingauthority"></a><tt>namingauthority</tt></td>
      <td nosave="">The naming authorities to search.&nbsp; Use &quot;*&quot; for all naming 
	  authorities and the empty string, &quot;&quot;, for the default naming authority 
	  (IANA).&nbsp; See <a href="Syntax.html#Service%20Type">Syntax</a> for more 
	  information on naming authorities.</td>
    </tr>
    <tr nosave="" valign="top">
      <td><a name="scopelist"></a><tt>scopelist</tt></td>
      <td nosave="">A pointer to a comma separated list of scope names.&nbsp; <i>May 
	  be the empty string</i> if you wish to use scopes this machine is 
	  configured for.&nbsp; May not be NULL.</td>
    </tr>
    <tr nosave="" valign="top">
      <td><a name="callback"></a><tt>callback</tt></td>
      <td nosave="">The address of an <tt><a
 href="SLPSrvTypeCallback.html">SLPSrvTypeCallback</a></tt>
	  function that will be called to report the operation completion status.&nbsp; 
	  May not be NULL. See <a href="Callbacks.html">Callbacks</a> for more 
	  information on how callbacks are used by the SLPAPI.</td>
    </tr>
    <tr nosave="" valign="top">
      <td nosave=""><a name="cookie"></a><tt>cookie</tt></td>
      <td nosave="">Pointer to memory that gets passed to the callback code.&nbsp; 
	  May be NULL.</td>
    </tr>
  </tbody>
</table>

<h3>Returns</h3>

<table nosave="" border="1">
  <tbody>
    <tr nosave="">
      <td nosave="">SLP_OK</td>
      <td>Indicates that the no error occurred during the operation.</td>
    </tr>
    <tr>
      <td>SLP_PARSE_ERROR</td>
      <td>The SLP message was rejected by a remote SLP agent. The API returns 
	  this error only when no information was retrieved, and at least one SA or 
	  DA indicated a protocol error. The data supplied through the API may be 
	  malformed or a may have been damaged in transit.</td>
    </tr>
    <tr>
      <td>SLP_AUTHENTICATION_ABSENT</td>
      <td>If the SLP framework supports authentication, this error arises when 
	  the UA or SA failed to send an authenticator for requests or 
	  registrations.</td>
    </tr>
    <tr>
      <td>SLP_AUTHENTICATION_FAILED</td>
      <td>If the SLP framework supports authentication, this error arises when a 
	  authentication on an SLP message failed.</td>
    </tr>
    <tr>
      <td>SLP_NETWORK_TIMED_OUT</td>
      <td>When no reply can be obtained in the time specified by the configured 
	  timeout interval for a unicast request, this error is returned.&nbsp; In other 
	  words, slpd is running, but something is wrong with it</td>
    </tr>
    <tr>
      <td>SLP_NETWORK_INIT_FAILED</td>
      <td>If the network cannot initialize properly, this error is returned.&nbsp;</td>
    </tr>
    <tr>
      <td>SLP_MEMORY_ALLOC_FAILED&nbsp;</td>
      <td>Out of memory error</td>
    </tr>
    <tr>
      <td>SLP_PARAMETER_BAD</td>
      <td>If a parameter passed into a function is bad, this error is returned.</td>
    </tr>
    <tr>
      <td>SLP_NETWORK_ERROR</td>
      <td>The failure of networking during normal operations causes this error 
	  to be returned.&nbsp; In OpenSLP, this is the error you'll get if an underlying 
	  socket() call failed.</td>
    </tr>
    <tr>
      <td>SLP_INTERNAL_SYSTEM_ERROR</td>
      <td>A basic failure of the API causes this error to be returned. This 
	  occurs when a system call or library fails. The operation could not 
	  recover.</td>
    </tr>
    <tr>
      <td>SLP_HANDLE_IN_USE</td>
      <td>Callback functions are not permitted to recursively call into the API 
	  on the same SLPHandle, either directly or indirectly. If an attempt is 
	  made to do so, this error is returned from the called API function.</td>
    </tr>
  </tbody>
</table>

<p>If no service types can be found, no error is returned.&nbsp; However, no 
calls (other than the SLP_LAST_CALL) will be made to the SLPSrvTypesCallback.&nbsp; 
Be aware, especially if the call is async, of error codes that may be passed to 
the <tt>SLPSrvTypeCallback</tt> callback function.</p>

<h3>Status</h3>

<table nosave="" cellpadding="5">
  <tbody>
    <tr nosave="" valign="top">
      <td nosave="">OpenSLP 0.7.4</td>
      <td nosave="">Fully implemented as specified by RFC 2614</td>
    </tr>
  </tbody>
</table>

<br />
<h3>See Also</h3>

<p><a href="SLPSrvTypeCallback.html">SLPSrvTypeCallback</a>,
<a href="Syntax.html">Syntax</a>,
<a href="Callbacks.html">Callbacks</a></p>

<p id="breadcrumbs0">Prepared by: <a href="http://www.calderasystems.com">Caldera Systems Inc</a><br />
Maintained by: <a href="http://www.openslp.org/">openslp.org</a></p>


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